Comment by anonymouskimmer

- The black market is always cheaper.

- Even in a legal market how many people are always buying their own?

- If everything is legal then it's even easier for people to spike drinks and the like.

- Purdue Pharma marketing issue writ large.

- Patients pressuring their doctors to prescribe, or alternatively feeling pressured by their doctors to use a particular drug.

- If it's legal it's easier to purposefully or accidentally overdose (e.g. alcohol today). Especially if it's also cheaper.

Off the top of my head.